# Relationship history for MSHA mine 2301957

Current hierarchy: **Riverstone Group → Central Stone Company → ANTONIA (CS56)**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **controller_controls_mine:** Riverstone Group → ANTONIA (CS56); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bellefontaine Quarry Inc → ANTONIA (CS56); 1987-01-01 to 2001-11-04; source msha-controller-operator-history
- **controller_controls_mine:** John H Berra Construction Co → ANTONIA (CS56); 1987-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John H Berra Construction Co → Bellefontaine Quarry Inc; 1987-01-01 to 2001-11-04; source msha-controller-operator-history
- **operator_operates_mine:** Central Stone Company → ANTONIA (CS56); 2001-11-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Riverstone Group → Central Stone Company; 2001-11-05 to current/open; source msha-controller-operator-history